feat: implement Phosphor solid icons throughout UI
- Downloaded Phosphor Icons (Fill variant) - 7000+ solid icons
- Added 18 Phosphor solid icons to assets/icons/:
- search, calculator, music, globe, camera, skills
- close, check, settings, trash, file, external
- mob (skull), ped (coins), loot (chest), weapon (crosshair)
- armor (shield), esi (syringe), target
- Updated overlay_window.py with IconHelper class
- Plugin bar now uses Phosphor SVG icons with color accents
- Floating icon uses Phosphor target icon
- Icons are solid/filled style matching EU game aesthetic
- Automatic fallback to emojis if SVG not found
Icons sourced from: https://phosphoricons.com
License: MIT (free for commercial use)
To add more icons:
1. Browse https://phosphoricons.com
2. Click 'Fill' filter
3. Copy icon name (e.g., 'sword-fill')
4. Add to assets/icons/ folder
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